PLANAR TRUSS

This kind of truss are just a simpletriangle structurekept over a road, bridge or a fall to support the structure and provide the basic stand and look to the architecture.

The depth of a truss, or the height between the upper and lower chords, is what makes it an efficient structural form. A solidgirderorbeam of equal strength would have substantial weight and material cost as compared to a truss. For a given span length, a deeper truss will require less material in the chords and greater material in the verticals and diagonals. An optimum depth of the truss will maximize the efficiency.

Figure. Snelson work

A planar truss from Kenneth Snelson's work is the most similar to the trusses exhibited. It only differs in the number and connection of the interlayer tendons. Figure above exhibits a rendering of Snelson's truss as it would appear in an infinite planar context. For each strut, there is a corresponding interlayer tendon which makes a fairly direct connection between the two layers and skirts the strut closely.

The close approach of the strut and the interlayer tendon makes the use of the truss in a spherical context difficult due to interference problems. A more usable approach for spherical contexts might be obtainable by threading the interlayer tendon through the middle of the corresponding strut.

Analysis of Planar Truss

Theprinciple of a trussis simple. The structure is composed of top and bottom chords triangulated with diagonals in the webs so that each member carriespurely axial load. Additional effects do exist but in a well designed truss these will be of asecondary nature.

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